Milking-machine.



M. LEITCH.

MILKING MACHINE. APPUCATIQN FILEDv FEB. 16l 1915, 1,163,161. Patented Dee. 7, A1915.

l" j 1E.

"UNITED sir-aras PATENTOFFCE.

, MEREDITH Maxine-MACHINE.

ricami.

Application met 'February 1s, 1915.: serial No. 8,455.

ToV allfwhom'itimay concern Be it known that I, 'MEREDITH Lm'rcir, a

'citizen' of the United States, residing at Poughkeepsie, county of Dutchess, aridl State of New York, have linvented anew and useful Improvement vin Milking-Machines, of which the following is a full,

clear, and exact description, reference beingY hadto the accompanyingdrawings, which form a part of this specification.

My inventionI relates to the class of milking machines having two-chambered teat cups. It isinore particularly intended for application to that class of machines, having two-chambered teat cups, in which an apf proximatelyl,continuous vacuum is main.-

ltained in tlie'inner or teat-receiving chambers, ywhile 1n 'the outer Aor pulsation chambers the pressure is'varied so as to cause regular manipulations ofl the teats. y

The `Objectoi' the invention 1s to providel Wa machine in which one pump cylinder or its equivalent serves to cause a constant suction on the nipples of the` teats, andato 'produce pulsations inthe outer teat cup chambers to cause a'manipulation of the upper portion of the base ofthe teat. v

In the accompanying drawings, which show preferred embodiments of my invention: Figure l is a diagrammatic view of the installation.Y Fig. 2 is a similar view of a modification. 4

The inner or teat receiving chamberof the two-chambered teat cup a is connected by a flexible tube b with a milk pail e. From one end 'of a pump cylinder j extends a pipe d l.other end of the'cylind'er' is an inlet portie.

`to'four similar teat cups.

having branches e and f, the former oo nnected with the outer or pulsation chamber of the teat cup a`,--and the latter communicate,l ing With the milkpail c. In branch f isa check valve g allowing' air to pass fromthe pail but preventing its return. Connecting with branch f between check valve g andthe pail is a regulating valve h designed to Open and admit air if, at any time, the vacuum in the pail exceeds a predetermined value. lIn c.

the cylinderj reciprocates-a piston z. vNear the endof the cylinder with lwhich 'pipe d y communicates is a by-,passl and near'the While 'only one tea-t jcup is shown, it Will .be understood that each of the pipes e and b is intended to have four lbranches connected Specification of Letters Patent.

Lnrrcir, 'or roUGnKEE-Psm, NEW YORK, AssrGNon To frm: DE LAVAL sereni-iron COMPANY, lA CORPORATION or NEW JERSEY.

l" Patented Dec.7., 1915.

v,In operation, piston i reciprocates practieally the full length of cylinder j. During' its outward stroke (to the right, Fig. 1)

it exhausts air from pipes d, e, f, the outer l outer teat cup chamber. vDuring the return stroke of the pump (to the left, Fig. l) theI air is compressedin these spaces until the.

1 fstOn, reaching the' position, shown in Fig.-v

is-exhausted from the pail'yto thedesired extent, 'and thereafter, at veach stroke, aL

small amount of 'air is admitted through the 1;) between the two ports of the byfpass Z, 4

regulator' h to prevent the vacuum becoming y l too great. Because of its connection with ythe pail throughl pipe b, the inner teat cup chamb is under an approximately constant suction` slightly less than the maximum produced by the pump. Because the outer teat cup chamber is in direct communication with the pump cylinder, the pressure therein -varies lfrom less than the lowest inthe inner teat cup chamber to more than-atmospheric. It will readily be understood that during the suction strokefof the pump the teat-cups will be expanded and the suction will 'draw the teats into the cup and at the same time cause them to fill with milk, and thatduring the returnl stroke of the pump the teats will be compressed, the milk will be forced out and the suction will draw it into' the pail.

Infghe/event that it is desired to rely upona maximum.' pressure equal to that of ythe atmosphere fOr-the manipulation of the teats, a nonLreturn air-discharge valve may be substituted for the by-pass Z and ya' oo nstant vacuum reservoir and a valve connecting thel pipe d alternately'with the reservoirand the vatmosphere may be provided. One construction embodying such a modification .is illustrated in Fig. 2, in which the piped is lconnected Witha cylinder opening Vat one end into a constant Vacuum reservoir fm,

and provided at the other end with an air. vport l0.'. The rod of piston 1' of the pump l f from the milkpail, throu -p 'te direction. The vacuum reservoir tmf as 'afi'e'g'u'l'ating valve y designed t o open fand' admit -air when the vacuum 1n 'the 1,5- vaouum lreservoir exceeds a vpredetermined value." f

` In operation-, piston r 'reciprocatesf racti'- cally the ull' length of cylinder si'. uringv its'outward'stroke (to therigh-t, VFigi-2), it

voir m and- (piston p having uncovered pipe d) air is exhaustedtlrro pipes, rl and f, -pipe c from; the outer teat cup chamber, and through .pipe -b 25 from the inner ,teatcup chamber. Onthe return stroke .of pistons'r and,ppipe d is .placed in communication, through cylinder n andport `o, vith the atmosphere, and air .underatmospheric pressure enters pipes d ande and the outer teatcup chamber. Pis-4 top p thus acts as a valve to 'connect pipe el alternately with the vacuum reservoir and the atmosphere.l 1 WhileV che' invention, ,in theemhodiment set forth,provides for placing the inner -teat cup chamber constantly under and --inl com-- municationwith a source of suction` the. in-

' vention contemplates the possibility, by means of. additions or modifications not 40 hereinV disclosed, of intermittently admitting air into the milk passage between' the inner teatcup chamber 'and the milk 'pail so as t produce lpulsations in the inner teat cup c amber. as well vas the -outer teat cup chamber. finch an arrangement vwould res'ult 'in an operation substantially the same as in' the Hulbert Patents `No. '1,043,013' and No.

y 1,070,134. Machines exhibiting these char` acteristics and constituting, therefore, an improvement on-the subject matter of this application, are set forth in applications iiledjofeven date herewith. l

I have-not herein claimed specifically the construction shown in Fig. 2, as a similar construction, having the same mode of operation, is set 4forth in an application filed by nie February 20, 1915, Serial No. 9500.

Having now fully described my invention, what I claim and desire to protect by Letters Patentis: A'

. .1. In amilking machine, in combination, a milk pail, a double chambered teat cup, and a common pipe line and means operatable ,therethrough to exhaust air from the pail F and the inner 'chamber of said teat cu'p and nder is extended through the heads of exhausts airfrom pipe lwv and vacuum' reser-4 vcup chanibenv.

to produce pneumatic pulsations in the outer 2. In a milking machine, in combination, adouble chambered teat cup, ya milk discharge from the'inner chamber thereof, and i' common pulsating means -connected Withj and operating to exhaust air from the milk dischargejand connected'with and operating to produce pulsations'in the, outerteat cup chamber;

43. In a milking a-'double chambered teat cup, a milk machine, in combination',b dis.

charge from the innerteat cup chamber 'closed from communication with 'the outer :teat 'cupchamber, vand common pulsating means to exhaust air from the outerteatv cup chamber' andmiiid 4. In al milking combination,

a double 'chambered'teat cup, a milk dis- Y i charge connected with the inner teat cup chamber, a pipecommunicating' with both vvthe milkdisc'harge'-and the outer teat cup chamber, means to `prevent How of air from said pipe to the milkfischarge, and means to produce pulsatioitfinsaid pipe.

5, In a. milking machine, in col'nbination,4

a double chambered teat cup, a milk vdischarge con'nnunicating" with. the inner te'at 'cup chamber and a'pillsatol adapted to con- .from the outer teat cup chamber` in such the milk discharge.

' trol the-flow of pressure fluid toward and 6. In a. milking machine, in combination,

'a double*V chambered teat cup, a milk discharge communicating with the inner teat -cuu chamber, a single pipe comiectible both with the outer teat cup chamber and the milk discharge", means to produce pneumatic pulsations in said pipe, and a nonreturn valve between the milk discharge and said pipe preventing return of air. from the pipe to the milk' discharge. 7. In a milking machine, in combination. a double cham'bered Ateat cup, a'milk connected with'the inner teat cup cham r, and means operating through a single pipe to exhaust air from the milk ail and simultaneously exhaust foul air om theouter teat cup chamber Without possibility ofs'uch foul air contaminating themilk.

8. In a milking machine, in combination, a. doublechambered teat cup, a milk disfrom said pipe to the lmilk discharge, and a primary pulsator adapted to control the ail' vcharge communicating withthe inner teat flow of pressure fluid back andforth in said 'pipe so as to produce pulsations in the outer teat cup chamber and 'adapted' also to exhaust 9. In a milkingvmachi'ne, in combination,

a double cham bered teatl cup, a milk dis-4 charge communicating with the inner teat cup. chamber 'und closedl from communication with the outer teat cup chamber, a- Single pipe ccnnectible both with the outer teat c'up and the milk discharge,l means to tointermit'tently vary! the pressure in the outer teat vYoup, chamber from a value xless than that in the innery teatcup chamber to value substantially higher than that in.

the inner t eat cup fcham'ber.

11. In ajmilking machine, in combination, f

a Adouble 'n chambered` teat cup,- common pulsating rneansto mamtam a partlal vacupres'suref fluid I from the milk (lischarge.

s ch amber,

N. Y., @Wanssum day MERE'DITH LEITCH.

um` in the inner teat cup chamber and to intermittently vary the pressure in the outer teat cup'chamber from a value less than that in the inner teatpcup chamber to a value not less than latmospheric pressure.

.12.' In a milking machine,'in combination,

a teat cup having an inner teat receiving j chamber and an outer pulsation chamber, e'

milkpail connected `with' the inner teat cup and a single cylinder pump operat-` ing through a single pipe line to exhaust air4 l s from .the 'milk' pail and thu`s produce a con.

tinuous exhaust'in the inner teat cut chamber and to produce `pneumaticpulsations in ythe outer'tea't cup chamber soas to compress the teat 4and alternately therewith expand` the teat clip and release vthe 'teats v In testimony of which invention, I have hereunto set ,'my' hand, at Poughkeepsie,

of Jan., 1915.

Witnesses l '.CHARLES, L. POWELL, EDWARDV F. WEIMAR. 

